Hisense Fridge is nonsense

I bought a Hisense fridge/freezer in February 2019 and around June the fridge starting acting up and it wasn't cold anymore. I reported the matter to Lawrence Cele, who told me I need to submit the receipt, which I did. and he told me he reported the matter to Hisense and someone from Hisense will call me. it's been 4 month and no-one is yet to call me or to inspect the fridge.

I want them to get their fridge back and they should give me back my money so I can buy another brand of fridge.

this is unacceptable and highly unprofessional. I have wastage daily, because I cant keep anything in the fridge